SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d58026fbeffb095d31108b8844f81726c2f55ffe14836ba90d937cc59f2a60c' 
  AND token = 'Eb8NLw/dqvzMgtxaWx0EO/XUghIZ++9V4S7r4GLuQRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}